JPH01308590A - One needle stopping device in two-needle sewing machine - Google Patents

Abstract

PURPOSE:To automatically stop a one needle on the desired side without enlarging a sewing machine, by arranging needle stopping bars projected from the upper ends of respective needle bars, and needle stop converting oscillating members provided with working ends oscillating at a butted position and a non-butted position at the time of the moving-upward of the needle bars, pivotally at the respective upper ends of both the needle bars. CONSTITUTION:A needle bar retaining member 6 is composed in connecting to a crank mechanism for fitting a connecting projection 19 axially on the driving source of a motor or the like and a connection-rotating upper-shaft, and reciprocating motion is performed in the upper and lower directions of arrow heads B. In a one-side needle stopping device in a two-needle sewing machine, when pressure application ends 9a, 9b is moved back (moved upward) and when the working end 16 of a needle stop converting oscillating member 15a (or 15b) is at the positions of the ends 9a, 9b, then by butting, a needle stopping bar 8a (or 8b) is moved downward to a needle bar 4. As this result, a needle bar driving ball 11 projected by a groove cam 12 is moved back, and sliding with the needle bar retaining member 6 is generated and at the same time, by a groove cam 14, a needle bar stopping ball 13 is projected and a engaged with a needle bar bearing block 1, and a one needle stopping state is set.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a single needle stop device for a two-needle sewing machine.

[Conventional technology]

Conventionally, double-needle sewing machines that can stop one needle have been used, and this type of single-needle stopping device uses a drive mechanism to move a pair of needle bars arranged side by side, each with a sewing machine needle attached to it. The needle bars and the needle clamp members are moved by the relative positional displacement in the axial direction of the needle stop bars, which are respectively provided to be slidable in the axial direction relative to the reciprocating needle clamp members and inserted through the upper ends of both needle bars. The needle stop bar protrudes from the upper end of each needle bar, and is provided with a needle stop block that slides to a position where the two needle bars come into contact when they rise. The needle stop block is selectively moved to the upper end position of one needle bar via a lever mechanism or the like to stop one needle on the desired side.

[Problem to be solved by the invention]

In the conventional configuration described above, one needle on the desired side is stopped by manual operation by selectively moving the needle stop block to the upper end position of one needle bar via a lever mechanism or the like.
Since sewing cannot be automated, there has been a demand for automation of the single needle stop device.

However, due to the relative positional displacement in the axial direction of the needle stop th bars inserted from the upper ends of both needle frames, the needle bar and the needle 1
In a structure equipped with a connecting means for releasing or restraining the holding member, a large elastic force is applied to a needle stop bar protruding from the upper end of the needle bar in order to maintain sewing side pressure, and this needle stop bar is suppressed or restrained. Since the sliding force for releasing becomes large, there is a problem in that the device for driving this becomes large in size.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a single needle stop device for a double needle sewing machine that can automatically stop a single needle on a desired side without increasing the size of the sewing machine device. It is something to do.

[Means for Solving the Problems] That is, the one-needle stopping device for the two-needle sewing machine according to the present invention attaches sewing machine needles to the lower ends of the needle bars arranged in parallel, and also allows the two needle frames to be reciprocated by the drive end. The needle bars and the needle clamp members are released by the relative positional displacement in the axial direction of a needle stopper bar, which is installed so as to be slidable in the axial direction relative to the moving needle clamp member, and is inserted through the upper end of each needle bar. Or, in a two-needle sewing machine equipped with a connecting means for restraining, a needle stop bar protrudes from the upper end of each needle bar, and an operating end that swings between a position where the needle bar comes into contact and a position where it does not come into contact when the needle bar rises. A needle stop conversion swing member is pivotally installed at each upper end of the double needle frame, and the double needle stop conversion swing member is independently driven by an actuator such as a solenoid or an air cylinder to stop one needle on the desired side. The gist of this is that

[Effect]

In the above configuration, each needle stop conversion swinging member that comes into contact with and separates from the needle stopper bar protruding from the upper end of both needle frames is swung between a position where the working end of the swinging member comes into contact with the needle stopper bar and a position where it does not come into contact with each other when the needle bar is raised. By pivoting the needle so that it can swing freely, even when a large elastic force is applied to the needle stop bar protruding from the upper end of the needle bar in order to maintain the sewing side pressure, the needle stop conversion swinging member is pivoted to maintain the sewing pressure. Since the state can be changed, it can be operated with a relatively small driving force. Therefore, it becomes possible to use a small actuator such as a solenoid or an air cylinder as a driving source, and it is possible to automate one needle stop without increasing the size of the mechanism.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a one-needle stopping device for a two-needle sewing machine according to the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 are schematic diagrams showing the head section of the two-needle sewing machine, and FIG. 3 is a sectional view showing the needle bar section. Reference numeral 1 denotes a needle bar support block protruding from the inner surface of the sewing machine body 2, and the cylindrical needle bars 4, 4 are vertically inserted into sliding holes 3, 3 formed in the needle bar support block 1, respectively. The shaft is installed so that it can slide freely. The lower ends of the needle bars 4, 4 protrude in parallel from the lower surface of the head, and have a structure in which the sewing machine needle N is attached by a needle clamp member 5. At the cutout position of the needle bar support block 1, the needle bar holding member 6 is slidably inserted through the sliding holes 7, 7. Symbols 8a and 8b are the needle bars 4
, 4 to the pressing end 9a.

9b is a needle stopper inserted so as to protrude, and the pressing end 9a is pressed by a coil spring 10.10.

A grooved cam 12 is provided to elastically bias the needles 9b in the direction in which they protrude, and to move the needle bar drive ball 11 forward and backward at a position where it engages with the needle bar holding member 6 from the needle bar 4.
, 8b constitutes a connection means with the needle bar holding member 6 which is released when displaced downward relative to the needle bar 4 and engaged when displaced upward. A grooved cam 14 is provided for moving the needle bar stop ball 13 in and out, and the needle bar support block 1 engages when the needle stop bars 8a and 8b are displaced downward relative to the needle bar 4, and releases when the needle bar stop bars 8a and 8b are displaced upward. The connection means for the. Reference numerals 15a and 15b denote suppressing ends 9a and 9 protruding from the upper ends of the needle bars 4 and 4, respectively.
b and working end 16. They are needle stop conversion swinging members that are swingably pivoted to support shafts 17 protruding from needle bar support block 1, corresponding to l'6, and their arm ends are connected to solenoid coils 18a and 18b. The working end 16.16 is raised by the reciprocating movement (arrow A) of the driving rod, and is in a position where it collides with or does not interfere with the suppressing ends 9a, 9b protruding from the upper ends of the needle bars 4, 4. It is rotated and displaced into position.

The needle bar holding member 6 is formed by connecting a connecting protrusion 19 that protrudes to the side of the member to a crank mechanism that is attached to an upper shaft that connects and rotates a drive source (not shown) such as a motor. It reciprocates in the direction (arrow B).

That is, the single needle stop device in the double needle sewing machine with the above configuration is as follows:
When the suppressing ends 9a, 9b move back (raise) and the working end 16 of the needle stop converting swinging member 15a (or 15b) is in that position, the needle stopper 8a (or 8b) moves to the needle bar 4 due to the collision. descend against. As a result, the needle bar drive ball 11 that had been protruding from the grooved cam 12 retreats and begins to slide against the needle bar holding member 6, and at the same time, the grooved cam 14
As a result, the needle bar stop ball 13 protrudes and engages with the needle bar support block 1, resulting in a state in which one needle is stopped. Also.

When the pressing end 9a (or 9b) is raised, if the working end 16 of the needle stop conversion swinging member 15a (or 15b) is out of that position, the needle stop bar 8a (or 8b) is returned by the coil spring. , rises relative to the needle bar 4. As a result, the needle bar driving ball 11 protrudes by the grooved cam 12 and engages with the needle bar holding member 6, and at the same time, the needle bar stop ball 13, which had been protruding by the grooved cam 14, retreats and slides with the needle bar support block 1. Becomes free and ready to sew.

The operating end 16 of the needle stop conversion swinging member 15a (or 15b) is connected to the 0N of the solenoid coil 18a (or 18b).
It is driven by a 10FF action, and its manual operation switch can be provided at a desired position on the sewing machine body 2, and it can also be configured to be automatically driven and controlled by a central controller.

Further, in the embodiment described above, the needle stop conversion swinging member 15a (or 1
5b) is shown as being driven by a solenoid coil, but it goes without saying that the drive mechanism for this part can use various actuators such as an air cylinder.

〔Effect of the invention〕

As described above, the one-needle stop device in the two-needle sewing machine according to the present invention engages the connecting means between the needle bar, the needle bar support block, and the needle bar holding member by the rotational displacement of the needle stop conversion swinging member. By adopting a structure in which the needle is stopped or released, the sliding resistance on the needle stop conversion swinging member is reduced, and the output of the actuator that drives it can be reduced, so it is possible to stop one needle without increasing the size of the mechanism. It has the feature of being able to be automated, and the effects after implementation of the present invention are extremely large.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view of a two-needle sewing machine head showing an embodiment of a one-needle stopping device in a two-needle sewing machine according to the present invention;
FIG. 2 is a side view of the same, and FIG. 3 is a sectional view showing the needle bar portion. 1... Needle bar support block 4... Needle bar 6... Needle bar holding member 8a, 8b... Needle stop bar 10... Coil spring 11... Needle bar drive ball 12.14
...Groove cam 13...Needle bar stop ball 15a,
15b... Needle stop conversion swinging members 18a, 18b...
Solenoid coil N...sewing machine needle

Claims (1)

[Claims] (1) Sewing machine needles are attached to the lower ends of the needle bars that are arranged in parallel, and both needle bars are each mounted so as to be slidable in the axial direction relative to a needle holding member that reciprocates by a drive mechanism,
In a two-needle sewing machine, the upper end of each needle bar is provided with a connecting means that releases or restrains the needle bar and needle holding member by axial relative positional displacement of a needle stop bar inserted from the upper end of each needle bar. A needle stop conversion rocking member having a needle stop bar protruding from the needle bar and an operating end that swings between a position where the needle bars collide and a position where they do not collide when the needle bars rise is pivotally mounted at each rear end of the two needle bars. ,
A one-needle stop device for a two-needle sewing machine, characterized in that the double-needle stop conversion swinging member is independently driven by an actuator such as a solenoid or an air cylinder to stop one needle on a desired side.